The fourth primogenitor - is the strongest vampire who exists only in
the world of legends; yet when this masters the 12 kenju, the spread of
the catastrophe of the vampires will appear in Japan.
In order to spy on and erase this, "fourth primogenitor," the
government owned Lion organization have decided to send an attacking
magician, "sword shaman" to complete the task. Yet unknowingly, the one
who was selected to spy was actually a trainee "sword shaman" girl -
Himeragi Yukina
